What is the working principle of performance testing tools

The working principle of performance testing tool  mainly involves the following aspects:

Scenario design: Performance testing tools need to design testing scenarios based on user needs and system characteristics, including determining testing objectives, number of concurrent users, load patterns, etc.

Script recording or writing: Testing tools can generate test scripts by recording user actions, or manually write scripts to simulate various user actions in the system. These scripts will be used to simulate the behavior of real users in the system.

Test execution: During the test execution phase, the tool will simulate user requests according to predetermined scenarios and scripts, and apply load to the system. This may include a gradual increase in the number of concurrent users, sustained high concurrency pressure, and so on.

Performance monitoring: During test execution, performance testing tools monitor various performance indicators such as response time, throughput, CPU usage, memory usage, etc. These indicators will be recorded for subsequent analysis.

Report generation: Finally, the performance testing tool will generate detailed test reports based on the monitored data. The report usually includes the performance of the system under different loads, identified performance issues, and suggested improvement measures.

Protocol simulation: The working principle of performance testing tools also includes protocol simulation, which involves simulating a single user and then extending multiple users through a single user. Simulate multiple users, and most performance testing tools use multi-threaded implementation. A thread simulates a user's concurrent requests by executing HTTP scripts, and the thread executes HTTP requests concurrently.

Client simulation: Simulate multiple users by launching multiple client programs and simulating end users clicking on the client program, driving the client program to send communication protocols to the server.

Through these steps, performance testing tools can simulate the behavior of a system under various load conditions to evaluate its performance under different pressures and identify potential performance issues.